How to loop part of a song
- Upload your song or video — MP3, WAV, M4A or MP4, up to 50 MB and 10 minutes. It opens right in your browser.
- Press A where the passage starts: the first word of the chorus, the first note of the solo.
- Press B where it ends. The loop starts at once: every time playback reaches B, it jumps back to A.
- Choose Infinite or Single — round and round without stopping, or once and a pause on A, ready for you to play or sing it yourself.
Need it lower, slower or without the vocals? Switch on Practice mode: the Audio Studio opens with the same file and the same loop, ready to transpose, slow down, tune and download.
Infinite loop or single loop?
The A/B loop has two modes, one click apart. They answer two different ways of practising.
Infinite loop
The passage plays over and over with no pause — from A to B, straight back to A — until you stop it. That is how a part gets into your fingers or your voice: by repetition. A riff, a drum fill, a run you want to sing without thinking.
Single loop
The passage plays once, goes back to A and pauses automatically. Press Play to hear it again. Made for listen-and-repeat: the phrase plays, then it is your turn to sing or play it in the silence — exactly what a teacher asks for in a lesson.
Precise to a tenth of a second
Points A and B are taken at the exact position of the playhead and kept to the hundredth of a second; the loop card shows them to the tenth, like 1:05.3. A quarter of a second is the difference between starting on a breath and starting on a word, so the loop lands where you put it.
The jump back to A is checked on every frame of the screen, about 60 times a second. A loop can be as short as 0.3 seconds — one word, one chord — or as long as the whole song. To fine-tune, drag the A and B flags along the bar, move with the ±5 s buttons, or use the keyboard: A and B set the points, L turns the loop on and off, Space plays and pauses.
Go further in Practice mode
The looper does one thing: loop. Practice mode, in the KeyPitch Audio Studio, builds a whole practice station around the same loop — and opens with your file and your A/B points already in place.
- One screen, nothing to scroll. The video — or, for an audio file, the lyrics you paste in — large on the left; the A/B loop and every setting on the right.
- A player made for placing A and B. The seek bar is wider, so every second gets more room and each point lands exactly where you want it — and the ±5 s jumps move you around the song in an instant.
- Transpose the key by semitones to fit your voice or your instrument — the tempo stays the same.
- Change the speed: slow a fast passage down to learn it, then bring it back to ×1.00 — the key stays the same.
- Adjust the pitch in Hz, from 415.3 to 466.2 Hz, to match an instrument tuned higher or lower.
- Reverb, 8D audio and a 10-band equalizer with six presets, plus one-click styles: Slow + Reverb, Speed Up and Garage.
- The AI Vocal Remover separates the voice from the music: sing over the instrumental, or learn the melody on its own.
- Download the finished file with its new key, speed and effects, in the format you brought: MP3, WAV, M4A or MP4.
Practice mode works on a computer with a screen at least 1024 pixels wide. It is free for 5 minutes a day, and unlimited with KeyPitch Pro. Save the song in My recordings and its loop is saved with it.
The free looper for music teachers and vocal coaches
This free online audio looper is ideal for singing teachers, vocal coaches, choir directors and music teachers. In a lesson, loop the exact bar the student is working on and go round it as many times as it takes, without reaching for the seek bar after every attempt. Single mode turns any song into a call-and-response exercise: the phrase plays, stops on A, and the student answers.
To prepare the lesson, Practice mode puts the song in each student's key and slows down the hard passage. Save it in My recordings with its loop, or send it with a Share link: the student opens the same track, in the same key, with the loop's points already set.
Who loops, and what for
- A worship choir works the bridge of a song before Sunday: Infinite until the harmonies settle, then Single so the choir sings it on its own.
- A guitarist loops the four hardest bars of a solo, slowed down in Practice mode, then brings the speed back up step by step until it is clean at ×1.00.
- A karaoke singer loops the chorus they will belt out on Saturday night, in a key that fits their voice, so they walk on stage ready to impress the room.
- A singing student loops the run they cannot nail yet, one breath at a time, until it comes out on its own.
- A pianist loops two bars of the left hand, a drummer a fill to count it, a bassist a line to transcribe it by ear.
- A dancer loops the eight counts of choreography being learned — with a video, the picture loops with the sound.